外文翻译---Wincc在供热站恒压供水监控系统中的应用

西门子自动控制系统在城市供热项目中的应用——Desigo
Insight上位机软件
康文骏
【期刊名称】《暖通空调》
【年(卷),期】2008(38)2
【摘要】作为全球技术性的领导者，西门子在区域能源市场素以其产品的质量及为用户提供的综合、专业的产品解决方案而闻名。

【总页数】6页(PI0019-I0024)
【关键词】自动控制系统;西门子;上位机软件;城市供热;应用;能源市场;领导者;产品【作者】康文骏
【作者单位】西门子楼宇科技
【正文语种】中文
【中图分类】TP273;TN929.53
【相关文献】
1.西门子WinCC上位机组态软件在酸再生站监控系统中的应用 [J], 孙涛
2.等离子体热处理工艺自动控制系统上位机监控软件的设计 [J], 何翔;孙奉娄
3.西门子S7-200PLC在城市污水处理厂自动控制系统中的应用 [J], 陈实武
4.TBH522短波发射机自动控制系统上位机软件设计 [J], 周韬
5.谈自动控制系统在城市集中供热中的应用 [J], 尹旭成
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外文文献原稿和译文原稿The water supply system is the national production and life indispensable important one annulus. The traditional method of water supply area, water pollution, infrastructure investment, but the main drawback is that water can not be kept constant, causing part of the equipment can not work normally. Variable frequency speed control technology is a new mature AC motor stepless speed regulating technology, its unique excellent control performance is widely applied to the speed control field, especially in water supply industry. Due to the safety in production and the water quality of special needs, for constant pressure water supply with the stringent requirements, so the frequency control technology has been more in-depth application. Constant pressure water supply ways to advanced technology, constant pressure, convenient operation, reliable operation, energy saving, high degree of automation, in pump station water supply can perform the following functions:( 1) to maintain constant pressure;( 2) the control system can be manual or automatic operation;( 3) a plurality of pump automatic switch operation;( 4) system of sleep and wake, when people stop when water, the system is in a sleep state, until the water demand automatically wake;( 5) adjusts the PID parameters on line;( 6) pump unit and circuit protection detection alarm, signal display.The actual pressure of the pipe network feedback and a given pressure were compared, when the pressure of a pipe network is low, increase the output of frequency converter, pump speed faster, water supply quantity increases, forcing the pipe network pressure rise. Vice pump speed slow down, reduce the water supply pipe network pressure drop,, to keep the constant pressure water supply.System hardware structureSystem uses a pressure sensor, PLC and inverter as a central control device, to achieve a desired function. Source: network transmission and distribution equipment installation in pipe line pressure sensor, for detecting the water pressure of the pipe network, converting pressure is 4 ~ 20 mA current or voltage signal is 0 ~ 10V, supplied to the inverter.Converter pump motor control device, in accordance with the constant water pressure needs to be 0 ~ 50 Hz frequency signal supply pump motor, adjust its speed SAJ converter is powerful, i.e. pre-programmed set parameter set, will use the required in the process of setting the number of parameters is reduced to a minimum, default value according to the application parameter of the macro choice and different. The system adopts the PID control application macro, closed loop control. Inverter based on a constant pressure corresponding to the voltage setting value and from the pressure sensor to obtain the feedback current signal, the use of PID control macro automatically adjust, change the frequency output value to adjust the control the speed of the pump motor, to ensure that the pipe network pressure constant requirements. The application of inverter in the constant pressure water supply 一．The characteristic and analysis of variable frequency speed regulation The water users in general is dynamic, so the water supply is insufficient or excess water supply situation has occurred. The water supply and the imbalance between the concentrated reflection in water supply pressure, namely water and water supply is less, the low pressure; less water consumption and water supply, the pressure. Keep the water pressure constant, can make the water supply and water balance between water supply and water for a long time, that is, less water when the water is less, so as to improve the quality of water supply.Constant pressure water supply system for the user is very important. In production and living water, if water supply due to insufficient pressure or short of water, may affect the quality of life, serious when can influence the survival safety, such as when a fire occurs, if the water pressure is insufficient or water supply, can quickly fire, may cause significant economic losses and casualties. Therefore, water area by means of Arts is the constant pressure water supply system, can produce great economic benefit and social benefit.With the development of electric power technology, frequency conversion technology perfected, with variable frequency speed control as the core of the intelligent water control system replaced the previous high level water tank and a pressure tank and water supply equipment, stable starting, the starting current can be limited within specified current, thereby avoiding the starting time of the impact of power grid; because the average rotational speed of pump is reduced, which can extend the pumps and valves and other things of life; to eliminate the start and stop of the water hammer effect. The stable and safe performance, simple and convenient operation, and complete and thoughtful function, will make the water supply and water conservation, energy saving, labor saving, ultimately achieve efficient operation.二．The application of variable frequency control constant pressure water supply modeUsually in the same way in the water supply system, setting multiple common pump, water supply when the quantity of multi pump full open, water supply on one or two hours. In the variable frequency speed control for constant pressure water supply, in two ways, one is all pumps with a frequency converter; and each water pump with a frequency converter. After a method based on pressure feedback signal, operated by PID automatically adjusts the output frequency of the inverter, change the speed of the motor, eventually reaching the purpose of network voltage, a closed loop, is relatively simple, but the cost is high. The previous method of low cost, less than kind of poor performance, but the control program is complex, is the future direction of development, such as the Shanghai arts and science and technology of constant pressure water supply control system can realize a inverter control any number of motor function. The principle mentioned below are multiple motor inverter drive system.三．The PID control principleAccording to the feedback principle: to maintain a physical quantity unchanged or essentially unchanged, it should bring the physical quantity and the constant comparison, to form a closed loop system. We want to keep the pressure constant, so we must introduce the hydraulic feedback value with a given value, thereby forming aclosed loop system. But the control system is characterized by nonlinear, inertial system, now the control method combined with PID in the large pressure fluctuation, using fuzzy control, in order to accelerate the response speed in the pressure range; using PID to maintain static accuracy. This through the PLC and intelligent instrument can show the algorithm, while the PLC programming to show when the pump frequency and inverter switching between. Practice has proved that, using this method is feasible, and the cost is not high.To maintain the constant pressure water supply network, according to the feedback theorem in network management system installed on the pressure transmitter as a feedback element, because of long, large diameter pipe system of water supply, pipeline pressure charging are slower, so the system is a big time lag system, is not easy to directly with PID regulator for control, and adopts PLC is involved in the control of the way to achieve the control system regulates the effect.四．Frequency controlUsing frequency control to realize constant pressure water supply, with adjustable valve to realize constant pressure water supply, energy-saving effect is very significant ( according to the specific circumstances calculated ). The utility model has the advantages of:1, starting balance, the starting current can be limited within specified current, thereby avoiding the starting time of the impact of power grid;2, because the average rotational speed of pump is reduced, thereby prolonging the service life of pump and valve etc.;3, can eliminate the start and stop of the water hammer effect;Generally speaking, when performed by a frequency converter to control a motor, just make the inverter motor capacity and the actual capacity of the motor can be. When one inverter control two motors, principle of inverter motor capacity should be equal to the capacity of the two motors. But if the peak load of water more than two pumps at full supply a lot of difference, Shanghai arts and science and technology engineers suggested, may be considered appropriate to reduce the capacity of the frequency converter, but attention should be paid to leave enough capacity.Although the pump at low speed, small working current of the motor. However, when the user with the water volume changes frequently, the motor will be in frequent ascending, descending and ascending, descending speed state, the current speed slightly over the motor rated current, cause the motor overheat. Therefore, the motor thermal protection is required. For this due to frequent ascending, descending speed and accumulated temperature rise, frequency converter in electronic thermal protection function is difficult to play a protective role, so should be used in thermal relay for motor thermal protection.The main function of preset, the highest frequency should be rated motor frequency converter the highest working frequency. Ascending, descending speed time in using PID regulator case, ascending, descending velocity time should be set to be short, so as not to affect the PID adjuster determines the dynamic response process. Such as the frequency converter with PID regulation function, as long as the preset set PID function effectively, the setting of the acceleration and deceleration time will automatically lapse.五．Constant pressure water supply system1, power: the optimal energy-saving control software, so the pump to achieve maximum energy efficiency;2. according to the actual water use, water saving setting pressure of the pipe network, the automatic control pump out the water, reducing the water running, leakage phenomenon;3, reliable operation: by the frequency converter to realize the soft starting of pump, the pump is realized by frequency to the frequency of the bumpless transfer, prevent network impact, to avoid the pipe network pressure gauge, pipe rupture.4, network function : the whole Chinese industrial control configuration software, real-time monitoring of each site, such as the motor voltage, current, frequency, pipe network pressure and flow. And the ability to accumulate each site electricity use, cumulative per pump out the water, at the same time to provide various forms of print statements, in order to analyze the statistical.5, flexible control: section water supply, water supply, manually select working mode.6, self protection functions: such as a pump failure, take the initiative to the PC alarm information, at the same time start standby pump, in order to maintain water balance. If the control system failure, the user can directly operate manual system, in order to protect the water supply.六．The system application1, water plant, pressure pump2, the residents living area, hotels and other buildings3, enterprise production water4, boiler circulating water system5, the farmland irrigation systemCompared with other water supply, frequency constant pressure water supply system, in addition to having significant energy-saving effect obviously, has the following advantages:1, constant pressure water supply technology by using the frequency converter to change the motor power supply frequency, and to adjust the pump speed to change the pump outlet pressure, than by regulating valve control pump outlet pressure, has a reduced resistance greatly reduced the effectiveness of the interception loss.2, because of the variable pump work in the frequency condition, at its outlet flow rate is less than the rated flow rate, pump speed is reduced, reducing the abrasion of the bearing and fever, to extend the pump and motor of the service life of the machine.3, pump adopts soft starting mode, by setting the accelerated acceleration time, avoid the motor starting current impact, on the grid voltage fluctuations caused by the impact, but also to avoid the sudden acceleration caused by motor pump systems surge. The complete elimination of water hammer.4, to realize automatic control, operating personnel do not need frequent operation, reduces labor intensity of workers, saves the manpower.Constant pressure water supply equipment1, frequency conversion control cabinet structure and principleVariable frequency pump control system through the pipeline pressure, the inverter system with built-in PID regulator operation, regulate the output frequency,and then to achieve a constant pressure water supply pipe network. The frequency of the transducer overrun signal ( generally used as pipeline pressure limit signal ) can be timely informed the PLC variable frequency pump switch. In order to prevent the occurrence of water hammer, pump switch is linked to the outlet valve.Variable frequency water pump control cabinet works as follows:Various types of directly from the municipal pipe network water tank ( box ). Such as: the construction of various types of ground water reservoir water, ground boiler cold water supplying, ground air conditioning system cooling water circulating pool water, ground water circulating pool water, fire and spray for ground water reservoir inlet. The intelligent variable frequency constant pressure water supply energy-saving control cabinet, frequency conversion water supply energy-saving control cabinet assumes the entire system is composed of four pumps, a converter, a PLC and a PID and a pressure transmitter and a plurality of auxiliary components. The function of each part are as follows : installed in the water supply pipe network pressure pressure transmitter will be converted into 1-5 volt electrical signal; frequency conversion speed regulator used for adjusting the pump speed to regulate the flow; PLC for logic switching. In addition, the system is also equipped with an auxiliary circuit, in order to ensure automatic control system failure can be regulated through the artificial way to maintain the system operation, to ensure continuous production.2, frequency conversion control cabinet features:According to tank ( box ) the height of the water level in the automatic control electromagnetic valve ( or electric valve ) opening and closing, in order to control the water tank ( pool ) of the water inlet and the tank ( box ) to automatically maintain a certain amount of water for use by the user.3, frequency conversion control cabinet selection instructions of variable frequency water pump control cabinet is mainly composed of variable frequency control box, a pressure sensor, pump etc.. Frequency conversion control cabinet comprises a circuit breaker, inverter, contactor, an intermediate relay, PLC etc..Variable frequency water pump control cabinet system selecting principlePump head should be greater than the actual height.Pump flow sum should be greater than the actual maximum supply quantity.Selection of variable frequency pump control cabinet:According to the user's water supply and water height determination model of pump and the number, then the control cabinet selection.ConclusionA high quality variable frequency control box, from the design, technology, manufacturing, transportation, packaging, is the actual products require a higher request, all aspects of quality assurance, can make the high quality and the level of control cabinet.Constant pressure water supply used in the field of1, water supply, community living and fire water supply system, and can also be used for hot water supply, constant pressure sprinkler system.2, industrial business life, production water supply system and the other factory needs constant voltage control areas ( such as air compressor system of constant pressure gas supply, constant pressure air supply ). On various occasions, the constant pressure control, cooling water and circulating water supply system.3, sewage pumping stations, sewage treatment and sewage lifting system.4, agricultural irrigation, garden sprinkler, waterscape and music fountain system.5, hotels, large public building water and fire system.译文供水系统是国民生产生活中不可缺少的重要一环。

１恒压供水基本工作原理系统采用变频调速方式自动调节水泵电机转速或加、减泵。

恒压供水自动控制原理框图如１图所示，它主要是由变频调速系统、ＰＩＤ调节器、压力传感器、液位传感器、动力控制线路等组成。

用户通过上位监控系统或控制柜面板上的指示灯、按钮、转换开关来了解和控制系统的运行。

图１恒压供水原理框图在基于ＰＩＤ的控制方式下，操作人员在操作界面设定供水压力，ＰＬＣ对压力设定值和测量值的偏差进行ＰＩＤ运算，并通过变频器调节配水泵转速，使供水压力保持在设定值。

２系统的硬件配置本系统采用西门子公司的Ｓ７－２００系列ＰＬＣ及其组态软件ＷｉｎＣＣＶ６．０构成恒压供水控制系统，实现供水过程的压力监控。

图２为恒压供水系统结构图。

工业以太网用于ＰＬＣ控制器和计算机操作站之间的通讯，远程Ｉ／Ｏ网用于ＰＬＣ控制器与变频器、软起动器的设备之间的通讯。

ＰＬＣ控制器主要用来监测和控制供水系统和供电系统，用于１＃～４＃加压泵的变频器采用ＡＢＢ公司的ＡＣＳ５１０－０１－０３１Ａ４变频器，５＃、６＃采用的是Ａ－Ｂ公司具有泵控功能的ＳＭＣＤＩＡＬＯＧＰＬＵＳ智能马达控制器，ＨＭＩ操作站选用ＤＥＬＬ计算机，工控机、服务器的工业以太网通讯网卡采用西门子公司的ＣＰ１６１２。

３系统的软件设计本控制系统软件采用西门子公司的ＰＣＳ７Ｖ５．２软件包，ＰＬＣ控制器采用ＳＴＥＰ７Ｖ５．２，ＨＭＩ监控系统采用ＷｉｎＣＣＶ６．０版本。

ＨＭＩ服务器和操作站都采用的是Ｗｉｎｄｏｗｓ２０００操作系统，具有开放的编程环境。

供热站使用ＷｉｎＣＣ组态软件主要监控恒压供水系统和输煤廊两部分。

实现对系统的自动检测和自动控制。

检测恒压供水和输煤廊运行设备的各项参数，实现实时数据的采集、上传、实时显示和记录。

控制机组运行、故障的自动停机和报警操作。

在恒压供水系统设定供水压力参数，实时监控调节加压泵，使供水压力保持定值。

在输煤廊中控制给煤量和给煤速度，监测给煤质量（煤的粉碎程度和含杂质量）。

毕业设计(论文)翻译资料课题名称：S7-200 PLC控制的变频调速恒压供水系统设计毕业设计(论文)起止时间：2007 年 3 月 1 日～ 6 月10 日(共17周)学生姓名：学号：指导教师：报告日期：The control and Energy-saving of automatic Water Supply SystemAbstract: Based one simple analysis of the methods for water supply used domestically and abroad, this paper discusses the principe and system’s structure of automatic water supply system by using frequency conversion speed regulation in detail. Then the system’s advantages are discussed and some key problems that should be pay attention to designing are presented.Keyword: Frequency conversion speed regulation; water supply with stable pressure: PID regulator.1、ForewordAt present , supply water in residential area and life of the skyscraper of our country generally adopt the way common frequently . It has heavy energy consumption, high noise ,and there has a great deal of questions in the source of water, such as secondary pollution etc. And it is a kind of comparatively ideal mode to adjust the watersupply device controlled rapidly with frequency conversion .Entering the middle and later periods of the 1990s, as the speed technology of frequency conversion achieves more development becomes perfect, the way of the full-automatic constant pressure that based on this technology supplied water has already been widely used in the developed country , and is becoming riper.In recent years, author has made some real work on rapidly to the transformation in frequency conversion supply water design and construction of control system , have accumulated some experience, and has formed the view on some questions. The reason why the energy-conserving principle frequency conversion of the water pump system of speed adjustment becomes popularized , is mainly because that it has a better energy- conserving result. To pump system of frequency conversion, the water pump after adjusting the speed has functional relation of the following:Q1/Q2 =n1/n2 (1) H1/H2 = (n1/n2)2 (2) of the type. Q1, Q2 represents the flow before and after the speed for the water pump respectively; N1, n2 represents the rotational speed before and after the speed for the water pump respectively; H1, H2 represents the lift before and after the speed for the water pump respectively . According the above:H1/H2=(f1/f2)2 Namely real lift of a water pump is power the square of frequency in direct radio. Therefore changing the power supply frequency of the electrical machinery of water pump through the frequency converter , can control supporting water pressure strength of the water pump . 2 constant pressure as Fig. 1 shows supply water of the automatically controlled frequency conversion water -supply system principle block diagram. P1 is the give pressure value, p2 for the actual pressure value had examined from the pipeline of the pressure sensor, PID regulator passes the error operation of the two value, and through controlling the frequency output of the frequency converter, thus make the pressure of the pipeline remain throughout on establishing value p1.This system can measure users' instantaneous water pressure adjust automatically , regulate the amount of quantity of supplying water and operation conditions of the electrical machinery in view of the above. Can according to give water pressure strength to set for and control pressure value which needed , make the equipment in the constant pressure state all the time, can know from load characteristic of electricalmachinery axle power and its the third power of in direct radio rotational speed of electrical machinery mixed, that is p1/p2=(n1/n2)3. For example, as the frequency converter output frequency for 35Hz (establish as 50Hz at most), that is to say that the actual rotational speed is 70% o'clock of specified rotational speed, the power consumption of the governor is 0.73 =0.343, account for specified 35%. That is to say , the water pump is always in constant pressure and turn the working state of matching the way into the flow , is it is it keep to exceed to dispel and backset current have work loss. Constant speed transfer with frequency conversion speed axle power change curve as Fig. 2 shows , relatively can know, it is the most obvious that frequency conversion adjusts the energy-conserving result of speed way.2、Case analyseConstant pressure is it regulate flow of water to the purpose to up to constant pressure through suiting well rapidly in frequency conversion to supply water, the goal that it controls finally is the water pressure. Controlling the target has non-linear , lagging characteristics. The quality of PID regulator performance , has determined the quality of the water -supply system to a great extent When the system is during the course of starting and stopping, or the pressure establishing value changes by a large margin , because there is a very great deviation within short time, no matter the controll algorithm of PID regulator adopts the increment type or the position type, its total mark one will fetch the cistern , water pump group (1M , 2M ) and complement the fittings to form relevantly. The core of this system is that frequency conversion adjusts the speed switch board, it monitors the pressure of the pipe network in real time through the pressure sensor , and change into the electric signal and offer the frequency converter to to make operation, through the controlling commonly of frequency converter , programmable controller PLC and relay array, adjust the system of supplying water rapidly after forming perfect full-automatic frequency conversion. Frequency converter is various in kind, for instance the types , such as Mitsubishi , Fuji , three Kenya and ABB ,etc.. Generally often select the pumps , special-purpose series of air blower for use. Whether take Mitsubishi FR-A140E as an example, it except general function had of brand , there are the following characteristics : The inside adopts the intellectual power module of IPM, it is lowest to make the noise of the electrical machinery to reduce ; Frequency converter, and work-frequency power can is it switch over to go on frequently, user is it is it start , stop through PLC and switch over the order automatically to input to need only, can conveniently through to lock movement switch over different water pump each other contactor, and does not need to design the tedious control procedure by oneself like the thing that in the past , this is one of this peculiar functions of frequency converter; Built-in instantaneous power cut starts and retries and starts the function , in a situation that nobody guarded, even if can be started by oneself after the frequency converter shuts down, totally realize with the operation of the automatic way. PID regulator available frequency converter of system this built-in value very heavy, this will store deviation in regulate. During the process of dispelling the deviation to regulate , must lead to the fact the system and present greater ultra mediation long-time vibration , can produce the serious integration saturation phenomenon also at the same time , thus influence thenormal running of the equipment. Is it drop the influence to most low to want , should adopt PID control method that integration separate among controlling algorithm, in order to reach the anticipated result. After dealing with like this , can shorten the system and reach steady transition course time greatly System allocate two 11kW water pump support 600 over resident water. Two pump offer large peak flow most when working at the same time, single platform meet the small flow and supply water at night. In addition all water pump can run by way of frequency conversion , can circulate way soft to start, in this way , can reduce the impact to the electric wire netting and pipe network . What merits attention is two pump when frequency conversion and worker are switched over frequently , have procedure it locks to be enough each other only, outputting must adopt machinery to interlock the contactor , can avoid the situation that two contactors close at the same time in the twinkling of an eye in this way, so as not to short out in twinkling of an eye causing power . pressure sensor P monitors the size of the water pressure signal in real time, the signal is dealt with by PID, input it to the frequency converter. At the small flow, water pump electrical machinery 1M turn round (whether 1KM1 is it shut to suck), and through feedback password change his rotational speed constantly, it is invariable in order to keep the pressure; In case of large flow , compare frequency conversion by pressure circuit send out through PLC " constant/changed switch over frequently" " operate and interlock " the order, machinery interlocks the contactor ( 2KM2 in 2KM (2KM1 +2KM2 ), contactor 3KM have the electricity. At this moment, electrical machinery 2M is started by way of frequency conversion, 1M is switched over and run at full speed frequently to run . In this way, this system can maintain water consumption on a invariable pressure all the time . Built up in the aforesaid district initial stage , supply water and adopt the way frequently of workers, because of energy consumption being heavy dependability is bad, the household reflects strongly. Use instead after frequency conversion supply water, installation total capacity reduce 25% than original equipment , economize on electricity the index is close 30% synthetically actually, the result is remarkable.3、Several questions while apply are in case of great majorityThe environment for use of the scene is comparatively abominable . Though frequency converter has very strong protection functions itself, such as owe keep , excessive pressure , is it flow to pass, electric current amplitude limiting is it make exactly to choose, overload, overheated lacking looking , shorting out and disconnected ink protect the function But must prevent trouble before it happens . Through using finding , two kinds of brands of Mitsubishi , Fuji, because has fully considered various kinds of abominable running environment in design and manufacture. The dependability and service life under the same condition are higher than some brands. One small city of mountain area of west place in Hubei in Hubei, average 1200m above sea level, the humidity on the high side of long-term most of the time (about 80%), the sulfur dioxide is seriously polluted, a set of frequency conversion that one factory produces supplies water of the equipment, because has not considered above-mentioned factors , less than one year, the relevant parts of the equipment are corroded seriously. And the like product which we designed , installedin the same area, because has fully considered the situations of different difference, on the selecting types of the equipment and component , have adopted the ship standard. Through the use of more than two years , ran well , stood the tests of different sternness. Find in using actually , the frequency converter itself is that a strong interference takes place in the source , will often influence the normal running of the equipment. Especially when the low rotational speed of the water pump operates, the frequency shown on the frequency converter does not correspond to actual operation frequency. Generally there are two kinds of spread ways to interfere: The circuit bunch is disturbed and space radiation is interfered. Can take the corresponding measure to solve according to the actual conditions of the scene. For example is it strain wave and absorb the return circuit to increase to programmable power end of controller, PID regulator introduction of unit output sure to have reliable shielding , link frequency converter , ground terminal of electrical machinery with earth stake firmly, control the line and motive force line leave certain distance , in order to strengthen and resist the electromagnetic ability to interfere. Only in this way ,can make system keep the long and steady working state in high temperature , humidity , mould , strong harsh terms of interfering etc..4、ConclusionsAre by way of adjusting the speed as the central water supply in frequency conversion, the result is obvious to economize on water , economize on electricity, can be extensively suitable for 20-10000 residents the biotope , skyscraper , hotels and retaurants , fire control or district pressurize and supply water, it is ideal facilities that the medium and small- scale waterworks supplied water too. Its amount of water quality supported is high, the economic benefits are obvious, the social benefit is enormous, with the development of national economy and constant improvement of the living standards of the people, it is sure to be used and popularized progressively in our country5、List of referencesZhang Wanzhong, Zhu Jie, Wang Mingquan. A kind of new-type frequency conversion constant pressure supplies water of the plan of design of the pump station. Electrical age, 1999 (10): 22-232Liu YingChun. Principle design of the sensor and application. Beijing: University of Science and Technology of the national defence publishing Presss, 1989.59-623Lu Guangda. Electric installation project manual of the building . Beijing: The electric publishing house of water conservancy, write the group in 1995.222- 2244 "The automatic projecting ". Give and drain off water the automatic project. Beijing: The electric publishing house of water conservancy, 1997.301-312恒压供水的控制与节能的探索摘要:在简要分析国内外给水系统现状的基础上,介绍了系统的组成,提出了以变频调速为核心所构成的全自动给水系统控制方式,并以实例详细分析了该系统的组成、工作原理以及在控制与节能方面所表现出的优越性.文中根据作者的实际使用经验,简要阐述了该系统在应用中应注意的一些问题。

Constant pressure water-supplyWith the progress development of social economic and the construct scale of city continuously enlarge, increasing of population and standard of living of people continuously improved, more and more demanding to quantity, quality and stability of water supply bring forward in city. The automatic degree of waterworks in town is much lower than the correspondence in city. Especially in some old waterworks, the equipment of automatic control system is dropped behind. The control of unit ismainly depended on manual operating of watches. The process of control is very complicated and that manual control can't meet the change of pressure in the pipes and the water level of the pure pond. It also can't act the proper feedback in time. For the sake of water supply, the electromotor unit usually works in the state of over charge. Not only efficiency of electromotor is low and electricity consuming is bigger, but also the pressure of pipes is overload in long term. On the basis of analyzing status in quo of the waterworks in our country, this paper designs a suit of constant pressure water supply automatic control system by using variable frequency speed-regulating technology based on PLC.The system is made up of PLC, transducer, units of pumps and electromotors, pressure sensor, industrial control computer and console. The system is used a transducer to make four electromotors starting, running and timing. The two high-power electromotors(220Kw) and low-power electromotors(160Kw) is partly circulated. To connect control computer with PLC and realize supervisal, a real time supervisal control software of water supply system is developed. The software has the function of data connection, communication, state control of facilities and data management.To tune up the frequency of power supply by the transducer in the system, this adjusting make the speed of electromotor and performance curve of pump change. At last, it make the status of a pump alter. Through analyzing the figure of energy wasting of pump, the quality in pipes is direct proportion of the speed of pump if the speed of pump is reduced. The power of electromotor fell the cube of the speed of pump. So the energy wasting of constant pressure water supply based on variable frequency speed regulating technology is envident less than the traditional mode isused throttle to supply water.Through using STEP7 MicroWin program software of SIMENS Company in German in the control system, a PID controller of pressure control within PLC isdesigned. The controller can compare the measure value and the value in advance of pressure. Through‘real-time controlling the output voltage and frequency of transducer, the output quality of pump is changed along with the changing of pump's speed. It makes the pressure of pipe self-regulating and steady in the scheduled value.There are some drawbacks such as conversion current is great, easy to burn the fuse and switch if off in variable frequency to working frequency of high-power electromotor. In the former researching, the conversion of variable frequency to working frequency is only emphasized the speediness. The conversion is usually failed because the key is not the speediness of conversion. Through analyzing and researching the problem of variable frequency to working frequency of high-power electromotor in theory, the key of conversion is pointed out in the paper. On the basis of analyzing equivalent circuit diagram and vector-diagram of induction-motor, the phase of working frequency power whether or not consistent with the output phase of variable frequency power at the moment of conversion is the key to decide whether the conversion is successfully.With the application of phase detector in industrial experiment on the spot, when the phase of working frequency power supply is consistent with the output phase of variable frequency power supply, PLC sends out the instruction to switch off the output of transducer. The electromotor is connected with the industrial frequency voltage after it was disconnected from the output of transducer. The conversion time is less than half hundred ms. The switch off current of variable frequency to working frequency is around one and half times of rating current of electromotor when the measures is made. It is succeed to solve the problem of variable frequency to working frequency and realizing the smooth conversion of high-power electromotor. It reduced the impact on power supply and equipments, too.The operation and experiment demonstrates that the system make the work of water supply automated in some degree. It is good for energy saving and improving the management of waterworks. It's also facility to mount and maintain, reliable to operating, and precise to supervise and control. The supervisory control software has abundant functions, kind interface and convenience to using.恒压供水随着社会经济的飞速发展，城市建设规模的不断扩大，人口的增多以及人们生活水平的不断提高，对城市供水的数量、质量、稳定性提出了越来越高的要求。

基于S7-200和WinCC变频恒压供水监控系统的设计
李静;赵晶
【期刊名称】《电脑与电信》
【年(卷),期】2009(000)008
【摘要】介绍了以下位机S7-200系列PLC和上位机WinCC为核心的水厂监控系统的设计.其硬件由SIEMENSS7-200 PLC、MM430变频器、水泵及PID控制方案组成,完成变频恒压供水的控制任务,由压力传感器及液位传感器完成压力及水位数据的实时采集,由FC-202B无线数传电台完成系统信息实时传递,由STEP7-Micro/WIN32程序开发软件完成程序的开发和调试,由WinCC6.0组态软件完成系统的监控和监测任务.
【总页数】3页(P45-47)
【作者】李静;赵晶
【作者单位】安阳工学院,安阳,河南,455000;安阳市节能监察中心,安阳,河
南,455000
【正文语种】中文
【中图分类】TP3
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1.基于PLC的智能变频恒压供水监控系统的设计 [J], 李海波
2.基于S7-200和MM440的变频恒压供水系统设计 [J], 蔡文举
3.基于西门子S7-200与WinCC的加热器测试系统设计 [J], 何小虎; 刘玉建; 李璐
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PLC和WINCC在供热控制系统的应用刘喜梅;郭静;褚衍贺【摘要】研究了以下位机S7-300系列PLC和上位机WinCC为核心的供热控制系统.其硬件主要由SIEMENS S7-300 PLC、MM430变频器组成,完成变频恒压供水的控制任务和现场的数据采集.并由WinCC6.0组态软件完成系统的监控.实际运行表明,该系统提高了供热水系统的稳定性与可靠性,减轻了工人劳动强度,实现了节能降耗.%The heating control system which uses S7-300 as subordinate computer and WinCC as supervisory computer is introduced. Its hardware consists of SIEMENS S7-300 PLC and MM430 converter to fulfill the task of variable frequency constant pressure water-supply and field data collection. Industry supervision software WinCC 6. 0 can achieve the task of monitoring. Practical operation demonstrates that the stability and reliability of the water supply system have been improved and the labor intensity of workers is reduced. The purpose of saving energy and reducing consumption has been realized.【期刊名称】《青岛科技大学学报（自然科学版）》【年(卷),期】2011(032)004【总页数】6页(P415-419,425)【关键词】PLC;变频器;WINCC监控;供热【作者】刘喜梅;郭静;褚衍贺【作者单位】青岛科技大学自动化与电子工程学院,山东青岛266042;青岛科技大学自动化与电子工程学院,山东青岛266042;青岛科技大学自动化与电子工程学院,山东青岛266042【正文语种】中文【中图分类】TP273城市供热是城市基础设施之一，是保证城市经济发展，居民正常过冬的必要条件。